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Re: [PATCH] Make muser-mode the default for LEON3
- From: Sebastian Huber <sebastian dot huber at embedded-brains dot de>
- To: Daniel Cederman <cederman at gaisler dot com>, gcc-patches at gcc dot gnu dot org
- Cc: daniel at gaisler dot com, ebotcazou at adacore dot com
- Date: Tue, 23 Jun 2015 14:29:04 +0200
- Subject: Re: [PATCH] Make muser-mode the default for LEON3
- Authentication-results: sourceware.org; auth=none
- References: <1435062156-28097-1-git-send-email-cederman at gaisler dot com> <1435062156-28097-2-git-send-email-cederman at gaisler dot com>
Instead of introducing a new option which may conflict with an existing
one, is it not possible to simply use -mno-user-mode?
On 23/06/15 14:22, Daniel Cederman wrote:
The muser-mode flag causes the CASA instruction for LEON3 to use the
user mode ASI. This is the correct behavior for almost all LEON3 targets.
For this reason it makes sense to make user mode the default. This patch
adds a flag for supervisor mode that can be used on the very few LEON3 targets
that requires CASA to use the supervisor ASI.
gcc/ChangeLog:
2015-06-22 Daniel Cederman <cederman@gaisler.com>
* config/sparc/sparc.opt: Add supervisor mode flag (-msv-mode) and
make user mode the default
* config/sparc/sync.md: Only use supervisor ASI for CASA when in
supervisor mode
* doc/invoke.texi: Document msv-mode flag
--
Sebastian Huber, embedded brains GmbH
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